That mod game is a complete mess. Not only is the English translation a mess, but the events are triggered all out of order. For instance, there is a weekend event where you are completely boning Lisa, but during the week you are only starting to kiss. On top of that, the art style between new and old game are different. Close, but different.
To answer your question, yes, he bones his mom in the original version (if I remember correctly). However, in my opinion, this "Another Story Rebuild" is the best version so far. Yes, it is incomplete, but the story follows a more natural progression, and the art is better.
